Ensure we don't crash if user navigates back from NTP to Chrome sign-in page before it has fully lo…

content/browser/web_contents/navigation_controller_impl.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_BROWSER_WEB_CONTENTS_NAVIGATION_CONTROLLER_IMPL_H_
 #define CONTENT_BROWSER_WEB_CONTENTS_NAVIGATION_CONTROLLER_IMPL_H_
 
 #include "base/callback.h"
 #include "base/compiler_specific.h"
 #include "base/gtest_prod_util.h"
@@ skipping 51 matching lines @@
                        const std::string& extra_headers) OVERRIDE;
   virtual void LoadURLWithParams(const LoadURLParams& params) OVERRIDE;
   virtual void LoadIfNecessary() OVERRIDE;
   virtual bool CanGoBack() const OVERRIDE;
   virtual bool CanGoForward() const OVERRIDE;
   virtual bool CanGoToOffset(int offset) const OVERRIDE;
   virtual void GoBack() OVERRIDE;
   virtual void GoForward() OVERRIDE;
   virtual void GoToIndex(int index) OVERRIDE;
   virtual void GoToOffset(int offset) OVERRIDE;
-  virtual void RemoveEntryAtIndex(int index) OVERRIDE;
+  virtual bool RemoveEntryAtIndex(int index) OVERRIDE;
   virtual const SessionStorageNamespaceMap&
       GetSessionStorageNamespaceMap() const OVERRIDE;
   virtual SessionStorageNamespace*
       GetDefaultSessionStorageNamespace() OVERRIDE;
   virtual void SetMaxRestoredPageID(int32 max_id) OVERRIDE;
   virtual int32 GetMaxRestoredPageID() const OVERRIDE;
   virtual bool NeedsReload() const OVERRIDE;
   virtual void CancelPendingReload() OVERRIDE;
   virtual void ContinuePendingReload() OVERRIDE;
   virtual bool IsInitialNavigation() const OVERRIDE;
@@ skipping 314 matching lines @@
   TimeSmoother time_smoother_;
 
   scoped_ptr<WebContentsScreenshotManager> screenshot_manager_;
 
   DISALLOW_COPY_AND_ASSIGN(NavigationControllerImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_WEB_CONTENTS_NAVIGATION_CONTROLLER_IMPL_H_